Power-transmitter.



J. S. FINCH.

POWER TRANSMITTER.

APPLICATION FILED ocr. al

Patented Aug. 29, 1916.

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1. S. FINCH. POWER TRANSMITTER.

APPLICATIN FILED OCT. 31. 19l3. T l 965535 Patented Aw. 29, 1916.

2 SHEETS-SHEET 24 Z Lf .YJ l j" J 1 .Z0 O y WHA/8858: /A/VENY'OH l A /mw/y. 5MM/@ w pf. /ZwLA ATTORNEY JOI-IN S. FINCI-I, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR IO THE SINGER MANUFAC- TURING COMPANY, A CORPORATION OF NEW JERSEY.

POWER-TRANSMITTER.

Specification of Letters Patent.

Patented Aug. 29, 1916.

Application filed October 31, 1913. Serial No. 798,409.

To all whom t may concern.'

Be it known that I, JOHN S. FINCH, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Power- Transmitters, of which the following is a specification, reference being had therein to the accompanying drawings.

rlllhis invention relates to improvements in power-transmitters, such forms of constructions as are adapted more particularly for use in connection with the operating of sewing machines and has for its object to better adapt it to manual control.

In the operation of the commonly employed power-transmitter no provision is made to arrest the action of the machine with the needle in a predetermined position with respect to its vertical movements. The operator simply rocks the foot-treadle in one direction to effect transmission of power and in the opposite direction to discontinue such power-transmission, and if it happens that the needle is brought to rest in the fabric the ordinary hand or band-wheel is resorted to for elevating it.

In the present construction there is employed a power-transmitter provided with positive stop-elements for predetermining the idle position of the needle with respect to its stitch-forming movements, substantially the same as is represented by lUnited States Patent No. 673,353, dated April 30, 1901 to E. B. Allen.

r1`he employment of a power-transmitter provided with manually controlled positive stop-elements demands a sensitive control of the foot-treadle by the operator, as a very slight movement of the trea'dle will permit of the stop-elements contacting, one with the other, with sufficient force to effect undesirable wear and noise, and to remedy this sensitive control of action of the stop-elements is the purpose of the present invention.

Reference being had to the accompanying drawings, Figure 1 is a view in front side elevation of one form of commercial sewing machine equipped with the stop motion mechanism represented by the patent previously referred to, to which latter is added the present improved means7 and to better illustrate the application of the latter the sewing machine table and the oil or drippan are shown partially in section. Fig. 2 is a rear side elevation of Fig. 1 the sewing machine frame being broken out to bring to .View certain details to be referred to later and Fig. 3 a side elevation of the stop-cam carried by the tight-pulley.

Referring to the figures, the sewing machine frame comprises a cloth or bed-plate 1 provided at its front and rear sides with downwardly extended plates 2 and 3, respectively, and at its front and rear ends with like plates (not shown), said plates being preferably formed integral with the bed-plate and at their lower edges provided with feet or rests, as 4:, said bed-plate being provided with the usual bracket-arm comprising the standard 5 and arm-bracket 6.

The main or driving-shaft 7 is mounted in suitable bearings (not shown) depending from beneath the bed-plate and at its rear end is provided with a loose and tight-pulley 8 and 9, respectively, and hand-wheel 10, and in suitable bearings formed in a rocking-frame 11 is mounted a vertically movable plunger 12, said bracket being pivotally suspended upon pintle screws, as 13, secured in the bracket 141 which, in turn, is suitably secured to the standard 5, a spring 15 normally acting to hold said plunger in its depressed position, the frame 11 having formed integral with it an arm 16 to the outer end of which is pivotally attached one end of a link 17, its opposite end being pivotally connected with la rod 18 which passes down through the bed-plate and at its lower end acted upon, through suitable connections later to be described, by a suitable manually controlled treadle (not shown) connected with the treadle-rod 19, to rock the frame 11 in the direction indicated by the arrow t, Fig. 1, or in a direction to connect the tight-pulley 9 with the source of arrow.

21 represents a stop-motion rcam carried by the tight-pulley and provided with an incline 22, cam-wall 23 and notch 24, in which latter the lower end of the plunger is seated when the machine is at rest, as in Fig. 1.

In the use of the stop-motion mechanism, supposing the machine to be at rest with the rocking frame 11 and plunger 12 in the positions illustrated in Fig. 1, which would position the lower end of the plunger 12 in the notch 24, as shown in Figs. 1 and 3, and it was Vdesired to start the machine, the operator, by manipulating the foot-treadle (not shown) would cause the frame 11 to be rocked to the position illustrated in Fig. 2, which would release the plunger from engagement with the `notch 24, and through the fork-lever 25 ship the commonly einployed driving belt (not shown) from the loose to the tight-pulley, in which adjustnient the operator would hold the frame ll until it was desired to arrest the action of the machine when, by releasing the control of the treadle, the spring 20 would` return the frame 11 to the position shown in Fig. l, thus causing the lower end of the plunger to ride the incline 22 and enter the notch 24.

As the present sewing machine and posi- .tive stop-motion mechanism are herein employed simply to facilitate an understanding of the construction and application of the present invention, it is not deemed necessary to further refer to their details in construction.

Referring now to the parts directly connected with the invention, 26 represents a bracket suitably secured to the underside of the sewing machine table 27, said bracket being provided with a rock-lever 28 connected at one end with the treadle connection wire 19 and at its opposite end provided with a step or rest 29 which, at the will of the operator, acts to raise the plunger 30 in opposition to the resiliency of the spring 20 and moves the frame 11 to the position shown in Fig. 2 which, as has been eX- plained, connects the main-shaft 7 with the source of power, and in eiiecting such adjustment of the frame the pawl 31 is caused, by the action of the plunger 32 and spring 33, to co-act with the circular notch 34 formed in the plunger 30, as shown in full lines, Fig. 2.

When it is desired to arrest the action of the machine the operator rocks the lever 28 to the position shown in dotted lines Fig. 2, which causes the link 35 to withdraw pawl 31 from engagement with the notch 34, thus permitting the spring 20 to return the frame 11 to the position shown in Fig. 1. Referring to Fig. 2, it will be seen that the sliding connection 36 is substantially mid-way of the slot 37 formed in the link 35 when the machine is being actuated, and at the rear end of said notch when the machine is idle, as shown in Fig. 1, and it is the lost motion existing between the sliding-member 3G and link 35 which permits of accidental movement of the lever 28, during the stitching operation, without endangering the contacting of the plunger 12 with the cam 21 by the accidental rocking of the lever 28.

Having thus set forth the nature of the invention, what I claim herein is 1. In a power-transmitter, the combination with means under control of the operator for effecting and for arresting the transmission of power and means, including positive stop-elements, foi' predetermining the idle position of the power transmittingc means, of means having` tlie saine control and acting simultaneously with the means for effecting the transmission of power arranged between said stop-elements and said manually controlled means for locking the stop-elements against accidental engagement during the stitching operation.

2. In a power transmitter, the combination with means under the control of the operator for effecting and for arresting the transmission of power and means, including positive stop-elements, for predetermining the idle position of the power-transmitting means, of means having the same control and acting simultaneously with the means for effecting the transmission of power including a latch arranged between said stopelements and said manually controlled means for locking the stop-elements against accidental engagement during the stitching operation.

3. In a power transmitter, the combination with means under the control of the operator for effecting and for arresting the transmission of power and means, including positive stop-elements, foi` predetermining the idle position of the power transmitting means, of means having the same control and acting simultaneously with the means for effecting the transmission of power including a spring-operated latch arranged between said stop-elements and said manually controlled means for locking the stopelements against accidental engagement during the stitching operation.

4. In a power-transmitter, the combination with means under the control of the operator, including a treadle, for effecting and for arresting the transmission of power and means, including positive stop-elements, for predetermining the idle position of the power transmitting means, of means having the same control and acting simultaneously 5 with the means for eifecting the transmission of power including a latch, a treadle connection lever and a latch-operating link for connecting said lever with said latch for locking said manually controlled stop-elements against accidental engagement during 10 the stitching operation.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

'JOHN S. FINCH.

Witnesses:

J. C. RINGE, F. W. CUTTING.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

